diff --git a/test/test_unit.py b/test/test_unit.py
index 57cfc41..a9ee274 100644
--- a/test/test_unit.py
+++ b/test/test_unit.py
@@ -20,7 +20,7 @@ from mylogger import my_logger
 from otp.otp import load_otp, save_otp
 from charge_control import ChargeControls
 from test.utils import DATA_DIR, record_position, latitude, longitude, date0, date1, date2, date3, record_charging, \
-    vehicule_list, get_new_test_db
+    vehicule_list, get_new_test_db, get_date
 from trip import Trips
 from libs.utils import get_temp, parse_hour
 from web.db import Database
@@ -212,6 +212,35 @@ class TestUnit(unittest.TestCase):
                                    'consumption': 1.08,
                                    'consumption_fuel_km': 10.53}])
 
+    def test_none_mileage(self):
+        get_new_test_db()
+        ElecPrice.CONFIG_FILENAME = DATA_DIR + "config.ini"
+        car = self.vehicule_list[1]
+        Database.record_position(None, car.vin, None, latitude, longitude, 22, get_date(1), 40, 30, False)
+        Database.record_position(None, car.vin, None, latitude, longitude, 22, get_date(2), 35, 29, False)
+        Database.record_position(None, car.vin, None, latitude, longitude, 22, get_date(3), 30, 28, False)
+        start = get_date(4)
+        end = get_date(6)
+        Database.record_position(None, car.vin, 11, latitude, longitude, 22, start, 40, 30, False)
+        Database.record_position(None, car.vin, 20, latitude, longitude, 22, get_date(5), 35, 29, False)
+        Database.record_position(None, car.vin, 30, latitude, longitude, 22, end, 30, 28, False)
+        trips = Trips.get_trips(self.vehicule_list)
+        res = trips[car.vin].get_trips_as_dict()
+        print(res)
+        assert compare_dict(res, [{'consumption_km': 5.684210526315789,
+                                   'start_at': start,
+                                   'consumption_by_temp': None,
+                                   'positions': {'lat': [latitude],
+                                                'long': [longitude]},
+                                   'duration': 120.0,
+                                   'speed_average': 9.5,
+                                   'distance': 19.0,
+                                   'mileage': 30.0,
+                                   'altitude_diff': 0,
+                                   'id': 1,
+                                   'consumption': 1.08,
+                                   'consumption_fuel_km': 10.53}])
+
     def test_db_callback(self):
         old_dummy_value = dummy_value
         get_new_test_db()
diff --git a/test/utils.py b/test/utils.py
index 4a41a50..9ddcc77 100644
--- a/test/utils.py
+++ b/test/utils.py
@@ -48,3 +48,7 @@ def record_charging():
     Charging.record_charging(car, "InProgress", date2, 85, latitude, longitude, "FR", "slow", 20, 60)
     Charging.record_charging(car, "InProgress", date3, 90, latitude, longitude, "FR", "slow", 20, 60)
     Charging.record_charging(car, "Stopped", date4, 91, latitude, longitude, "FR", "slow", 20, 60)
+
+
+def get_date(offset):
+    return date3 + timedelta(minutes=60 * offset)
diff --git a/trip.py b/trip.py
index 15a8960..d034bd6 100644
--- a/trip.py
+++ b/trip.py
@@ -159,14 +159,14 @@ class Trips(list):
                         logger.debugv("%s mileage:%.1f level:%s level_fuel:%s",
                                       res[x]['Timestamp'], res[x]['mileage'], res[x]['level'], res[x]['level_fuel'])
                     next_el = res[x + 2]
+                    distance = 0
                     try:
                         distance = end["mileage"] - start["mileage"]
-                        duration = (end["Timestamp"] - start["Timestamp"]).total_seconds() / 3600
-                        speed_average = distance / duration
                     except TypeError:
-                        logger.exception("Bad value : ")
-                        distance = 0
-                        speed_average = 0
+                        logger.debug("Bad mileage value in DB")
+                    duration = (end["Timestamp"] - start["Timestamp"]).total_seconds() / 3600
+                    try:
+                        speed_average = distance / duration
                     except ZeroDivisionError:
                         speed_average = 0